Once again, aRtBee nails it. The Internet provides us with the opportunity to take advantage of different media, and you can integrate them all into a single tutorial. Text allows the student to easily skip past sections, re-read parts or spend as much time as they want in different areas. I'd never thought about it before, but text is probably the preferred medium for the WHY parts, mainly because of the ability to skip past sections that the user either doesn't care about or already knows. Images are great for illustrations (of course) and for showing detail. Videos are great for the how-to stuff, but they tend to lock all students into the same pace.

One more suggestion before I go is to not be afraid to be politely critical of Poser or whatever software you're writing about. Too often glaring problems of the applications are dismissed, ignored, danced around or even presented as features. For example, Poser is an unstable app. It crashes a lot. So say so, and mention that if Poser's behavior starts to look a little bizarre, the app is probably in its death throes, so save your stuff and restart it. Poser also has some serious usability issues (content management comes to mind). Just say so and move on.

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OS: Windows 10 64-bit, Poser: 10